Corner reenforcement



Patented Oct. 11, 1932 UN E 3 5 l FF- isaises GEORGE D". MATHE'ns'Ann HORACE; c. itArnnli-sj rms aeaeae, oAiiIroRnIA M CORNER mswe eemm Application filed May 5; 1930; Serial No.1 449,830)

invention is a reenf orcenient 61" a corner of a plasteredsurface, and hasfor its object to bind the plaster inthef corner so as to prevent cracking; and also provide guide? 5 means for insuring a trueright-angaila corner having the apexof its angle extending in anexactlystraight line. p

More particularly it is an objectof the'in-f vention to 1 mount anelongated angle beadi 1!) in the interiorcor ner formedby the laths of a structure which isto be plasteredJ SQ that the bead formsa guide which fwill definitely determine the thickness ofthe-plaster coating; and insure a true right-angle surface, with the apex-of itsflangle forming a; straight line. 7

It is aiurther particular object of the in-j vjention to provideanangle head which will,

positively lock the plaster in an interior corner and-therebyeliminate cracking, v

Further objects of the inventionwillbe readily understood from the following -de-.

scription of the accompanying drawing, in which:

Fig; 1 is a perspective view of theinterior corner of a plasteredwall, showing the improved reeniorcement.

Fig. 2 is a transverse section on the line, 2-2 of Fig; 1, l

The invention is illustrated in connection with a usual interior corner of aframe structure adapted to receive plaster coating and comprising right-angularly disposed vcooper-1 ating studs 1 having 'laths Qmounted thereon.

The reenforcement for thercojrneri is an elongated angular bead adaptedto. tem um ed on the lathe. at-th'e interiorlcorner which is formed thereby, and preferably comprising an elongated sheet metal gstrip. In crosssection gth'esheet metal strip is bent at right angles medially of its width so as to form wings 3-3, with the wings then bent so as to form acute angular ribs H projecting toward one another, and the outer edges of the metal form marginal strips 5-5 in the planes of wings 3. V v The right-angular head is mounted on laths 2 in the corner of the framing, and extends the full length of the corner with suitable fastening means such as nails 6 driven through the marginal strips 5 for securing he' ead n. Pla e; a d ew s 3 d i are respectivelyprovided with apertures 7 and 8 "adapted to receive the plaster for o king it to he' ad- Aplaster coating 9'is applied to lathsQ in the usual mannerfand this plaster coating is alsdapplied to marginal strips 5 andwings 8 o i he smly h h rib Proje ti g a into the plaster coating as shown in'Fig Q, no The Pla te hus n s; per u 7 a 8 for locking it to tlgieb'ead; and as shown in Fig; 2 the ribsecooperate to forma dove tail groove for positively locking the corner portion oftheplaster coating to the bead sow astoprevent cracking atthe cornerg v The plaster coating 9 is smoothed down to uniform and standard'thickness by a usual" darby as shown in Fig. 2 and the ribs. 4 Pr j adi nqe; er by th e y; by r sting at one d agains the P rt n, 9 Pl s e c ing hi h haseady b en. dirc d'w aiig rd h ckness a sho n at and resting at its opposite end against one of the ribs asshown atC, will gauge the plaster pat a s thei es reiwstan 'ar ;t ickness? one side of the corner, while end-abutment of/che darby against :the other rib 4 as shown r at D will similarly reduce the plaster'coating at the other side of the corner-tothe desired '86 standard thickness. The darbyby its abut? meat -D a s h .?il thu orm a true right angle surtace for the cornerof the Plaste at ng etw r he' c op a n s. and said. definite positioning ofthe darby alsoinsures the apex E of theangle which is formedby the corner-of tli-e pjlaSt8IQXt- Ild ns n a t aigh -line s ini n l i When the plastering is completed atone side of thecorner, the-darby" is ozf course similarly used upon the 'plaster'surface at the other 7 side of the corner, so that the faoe ofithe darby rests upon the rib 4; which projects from said'other side o.f;the corner, and its end surface abuts against the oppositeas. previously described, I thereby tru'ing -up said other side oi -the corner o fthe plaster. W e h P r et nea ll sfinish ei e extreme apices ofaribs it are of course vis; iblethrough the surface of said coating: as

shown at F, since the darby by its abutment against the ribs will have smoothed down the plaster coating flush with the apices of the ribs, but the usual finish coating of plaster which is then applied as shown at 10 will coverand conceal the apices of the ribs and thus provide a usual continuous surface when the plastering is completed. The fin ish coating 10 is relatively thin, and with the coating 9 forming a true right-angular cor-. ner with the apex of its angle in an exactly straight line, the thin coating 1O -may be applied to this geometrically true foundation so as to readily maintain the desired exact angularity of the finished surface.

WVe have thus provided simple and inexpensive but practical means for reinforcing the corner of a plastered surface, so as to positively lock the plaster in the corner against the possibility'of cracking and also readily gauge the plaster by a usual darby so as to insure uniform thickness at the corner, with said corner forminga true rightangle having its apex extending in an exactly straight line.

It will be noted that by forming the ribs 4 so that their sides form acute angles, the said ribs have wide bases providing a firm foundation whereby the ribs are rigid with relation to elements 3-5 of the head, so that distortion of the ribs is avoided; and since the sides of the ribs project from elements 3-5 at angles greater than right angles, the chance of the plastercracking at the junction of the ribs with the bead is appreciably less than if the ribs projected perpendicularly therefrom. Furthermore by providing acute angular ribs rather than perpendicular ribs, the said ribs form vertical channels in back of, he same which will be fillcdwith plaster through apertures 8 so as to rigidlylock the ribs against distortion and provide a substantial plastic look across the ribs between the plaster on the marginal strips 5 and the plaster in the angles which areformed by wings 3. 7 V

An extremely efficient and practical ribbed structure is thus provided, with the ribs securely held against distortion with relation to the rest of the bead and reenforced by the plaster which forms locking keys extending across the back of'the ribs, while at the same time positioningthe ribs so that their apices are adapted for engagement by a usual darby so as to form a guide for plastering the corner in which the bead is mounted.

We claim:

1. An angle bead adapted for embedding in a plastic material at a corner thereof and having an abutment bent therefrom with the sides of said abutment convergingly tapering to form a projecting acute angular apex, said apex of the abutment being adapted for engagement by a surfacing tool and said abutment extending into the'plastic material projecting respective engagement by the face and end of a surfacing tool, and the abutments extending into the plastic material from the respective sides of the angle head to a distance equal to the desired thickness of the plastic material, said abutments cooperating to form a'recess at the angle of said head adapted to receive the plastic material for binding engagement, and said abutments having apertures opening through their respective sides in spaced relation from their apices and adapted to receive the plastic material so that said plastic material fills the spaces in back of the convergingly tapering abutments.

3. An angle bead adapted for embedding in plastic materialat a corner thereof and: having abutments bent from the respective sides of the angle bead with the sides of said abutments convergently tapering to form projecting acute angular apices adapted for respective engagement by the face and end of a surfacing tool, and the abutments extending into the plastic material from the respective sides of theangle head to a distance equal to the desired thickness of the plastic material, said abutments cooperating to form a dovetail recess at the angle of said bead adapted to receive the plastic material for binding engagement, and said abutments having apertures opening through their respective sides in spaced relation from their apices and adapted to receive the plastic material so that it fills the spaces in back of the convergently tapering abutments and forms an integral continuation of the plastic maacute angular apices adapted for i in 

